[rules-users] Drools and OSGi
Robert
robert.weissmann at web.de
Thu Apr 15 03:21:42 EDT 2010
Hi Aerv,
soon I will also have to launch Drools within an OSGI environment, but I
am not there yet. But within another context (jBPM) I had some troubles
looking similar you are having.
It had something to do with the classloading. jBPM did not provide any
OSGI-support, whereas Droos does, so I am not sure if this fits, but I had
to wrap here and there some classes so they got pulled in by the right
ClassLoader (OSGI uses many class-loaders).
final ClassLoader origCl =
Thread.currentThread().getContextClassLoader();
final ClassLoader cl =
<YOUR_CLASS_YOU_WANT_TO_USE>.class.getClassLoader();
Thread.currentThread().setContextClassLoader(cl);
... use the class ...
Thread.currentThread().setContextClassLoader(origCl);
Maybe this helps,
Cheers, Rob.
Am 14.04.2010, 20:27 Uhr, schrieb Wouter Van Isterdael
<woutervanisterdael at gmail.com>:
> I still seem to be having problems getting it working. The problem did
> not
> go away.
>
> I still get the same error. Would anyone know of a simple step-by-step
> tutorial for using Drools in a Felix OSGi environment? Preferrably within
> Eclipse and with Pax Runner.
>
> Any help would be very much appreciated.
>
> Thank you for your time!
>
> Kind regards
>
> Aerv
>
> 2010/4/6 AervTerrh <woutervanisterdael at gmail.com>
>
>> Thanks for the reply. I will try this tomorrow and keep you posted!
>>
>> 2010/4/5 Jason Davidson [via Drools - Java Rules Engine] <[hidden
>> email]<http://n3.nabble.com/user/SendEmail.jtp?type=node&node=698969&i=0>
>> >
>>
>>> I don't know if this helps, but I had to turn the MVEL JIT compiler
>>> off in
>>> the Equinox OSGi container:
>>> OptimizerFactory.setDefaultOptimizer("reflective");
>>>
>>> Also, we used pre-compiled packages instead of compiling the DRL files
>>> at
>>> runtime. For example:
>>>
>>> ....
>>> RuleBaseConfiguration ruleBaseConfig = new
>>> RuleBaseConfiguration();
>>>
>>> ruleBaseConfig.setClassLoader(this.getClass().getClassLoader());
>>>
>>> //MVEL in OSGi is a complete CF - this turns off the MVEL
>>> JIT
>>> - potential resource hog but that's the nature of OSGi classloading
>>> //and Drools...
>>> OptimizerFactory.setDefaultOptimizer("reflective");
>>>
>>> RuleBase ruleBase =
>>> RuleBaseFactory.newRuleBase(ruleBaseConfig);
>>>
>>> InputStream pkgIs =
>>> this.getClass().getResourceAsStream("/com/cjs/hazel/rules/com.cjs.hazel.rules.pkg");
>>> addPackage(ruleBase,pkgIs);
>>> .....
>>>
>>> On Fri, Apr 2, 2010 at 4:42 PM, AervTerrh <[hidden
>>> email]<http://n3.nabble.com/user/SendEmail.jtp?type=node&node=698731&i=0>
>>> > wrote:
>>>
>>>>
>>>> Hey,
>>>>
>>>> Okay. I know this problem can be found all over. But I can't seem to
>>>> figure
>>>> out a solution to it. Somehow I must be doing something wrong. I've
>>>> created
>>>> a simple application that evaluates some rules and changes some
>>>> objects
>>>> based on that. Everything worked fine, not a single problem there. All
>>>> libraries could be easily found etc.
>>>>
>>>> Now I wanted to convert this to a Felix OSGi bundle.
>>>>
>>>> So, what I did, was creating a bundle (new plugin project based on
>>>> existing
>>>> jars) with the drools jars (core, compiler, api, jsr) and tried the
>>>> next
>>>> code in the RuleEngine class:
>>>>
>>>> Properties props = new Properties();
>>>> props.setProperty("drools.dialect.java.compiler", "JANINO");
>>>> KnowledgeBuilderConfiguration config =
>>>> KnowledgeBuilderFactory.newKnowledgeBuilderConfiguration(props, null);
>>>> (here's where it fails)
>>>> KnowledgeBuilder kbuilder =
>>>> KnowledgeBuilderFactory.newKnowledgeBuilder(config);
>>>> kbuilder.add(ResourceFactory.newClassPathResource(fileName,
>>>> RuleEngine.class), ResourceType.DRL);
>>>>
>>>> This is pretty much the loading of the rule file. The RuleEngine is
>>>> started
>>>> in an Activator. The file is found and everything. But I keep getting
>>>> the
>>>> same error when starting the bundle.
>>>>
>>>> org.drools.RuntimeDroolsException: Unable to load dialect
>>>> 'org.drools.rule.builder.dialect.mvel.MVELDialectConfigurati
>>>> on:mvel:null'
>>>> at org.drools.compiler.PackageBuilderConfiguration.addDialect(P
>>>> ackageBuilderConfiguration.java:274)
>>>> at org.drools.compiler.PackageBuilderConfiguration.buildDialect
>>>> ConfigurationMap(PackageBuilderConfiguration.java:259)
>>>> at org.drools.compiler.PackageBuilderConfiguration.init(Package
>>>> BuilderConfiguration.java:176)
>>>> at
>>>>
>>>> org.drools.compiler.PackageBuilderConfiguration.<init>(PackageBuilderConfiguration.java:148)
>>>> at org.drools.builder.impl.KnowledgeBuilderProviderImpl.newKnow
>>>> ledgeBuilderConfiguration(KnowledgeBuilderProviderImpl.java: 21)
>>>> at org.drools.builder.KnowledgeBuilderFactory.newKnowledgeBuild
>>>> erConfiguration(KnowledgeBuilderFactory.java:68)
>>>> at test.Activator$RuleCreator.createRule(Activator.java:52)
>>>> at test.Activator.start(Activator.java:32)
>>>> at org.apache.felix.framework.util.SecureAction.startActivator(
>>>> SecureAction.java:639)
>>>> at org.apache.felix.framework.Felix.activateBundle(Felix.java:1 700)
>>>> at org.apache.felix.framework.Felix.startBundle(Felix.java:1622 )
>>>> at org.apache.felix.framework.Felix.setActiveStartLevel(Felix.j
>>>> ava:1077)
>>>> at org.apache.felix.framework.StartLevelImpl.run(StartLevelImpl
>>>> .java:264)
>>>> at java.lang.Thread.run(Unknown Source)
>>>> Caused by: java.lang.ClassNotFoundException:
>>>> org.drools.rule.builder.dialect.mvel.MVELDialectConfiguratio n
>>>> at java.net.URLClassLoader$1.run(Unknown Source)
>>>>
>>>>
>>>> The packages I import in the manifest:
>>>> Import-Package: org.codehaus.janino;version="2.4.3",
>>>> org.drools,
>>>> org.drools.builder,
>>>> org.drools.compiler,
>>>> org.drools.io,
>>>> org.drools.rule,
>>>> org.drools.rule.builder.dialect.java,
>>>> org.drools.rule.builder.dialect.mvel,
>>>> org.osgi.framework;version="1.3.0"
>>>>
>>>> In my target platform I add the the drools project I created (with
>>>> drools-xx.jar (the necessary ones), I also added the following:
>>>> -ant
>>>> -antlr-runtime
>>>> -janino
>>>> -jsr94
>>>> -xstream
>>>>
>>>> But I can't seem to get it working... Does anyone know what can be
>>>> done
>>>> about this? Or a working example of Drools in Felix OSGi would also be
>>>> helpful.
>>>>
>>>> Any help is very much appreciated, I've been looking into this for
>>>> days.
>>>>
>>>> Thanks!
>>>>
>>>> Kind regards,
>>>>
>>>> Aerv
>>>> --
>>>> View this message in context:
>>>> http://n3.nabble.com/Drools-and-OSGi-tp694011p694011.html
>>>> Sent from the Drools - User mailing list archive at Nabble.com.
>>>> _______________________________________________
>>>> rules-users mailing list
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>>>>
>>>> https://lists.jboss.org/mailman/listinfo/rules-users
>>>>
>>>
>>>
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>>
>>
>>
>> --
>> __________________________________
>> Van Isterdael Wouter
>> Roesbeke 27
>> 9402 Meerbeke
>> 0496401476
>>
>> ------------------------------
>> View this message in context: Re: Drools and
>> OSGi<http://n3.nabble.com/Drools-and-OSGi-tp694011p698969.html>
>>
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>>
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